(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Related People

Abstract

Certain high temperature processes or chemical reactions must be carried out at constant volume, e. g., to avoid losses of a volatile component, to establish an equilibrium pressure, etc. A procedure which satisfies this condition uses crucibles of non-reactive material which can be sealed. Sealing graphite containers is difficult because of the mechanical properties of this material.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
88% of the total text.

Page 1 of 2

Method of Sealing Graphite Crucibles for High Temperature Application

Certain high temperature processes or chemical reactions must be carried
out at constant volume, e. g., to avoid losses of a volatile component, to establish
an equilibrium pressure, etc. A procedure which satisfies this condition uses
crucibles of non-reactive material which can be sealed. Sealing graphite
containers is difficult because of the mechanical properties of this material.

This method seals graphite crucibles against gas pressure reactively welding
the graphite through the formation of high melting carbide using low melting
metals. In the drawing, sample A is melted at a temperature of 2000 degrees C.
Above 900 degrees C a volatile component starts to evaporate. In order to avoid
losses of this component, a graphite container is used and sealed as shown.

The metal part of the piston-fitting plug, such as La, melts and reacts with
graphite at 800 degrees C forming a high melting carbide LaC(2) having a
melting point of 2355 degrees C. Such provides a weld between the graphite
plugs and the container forming a solid high melting pressure tight seal. By using
a thermal gradient, it is possible to initiate the welding process with minimum
heating of the sample. Instead of La, other metals such as Co, Cr, Ni, Si, Ce and
the other lanthanide metals can be used, which have a low melting point or form
a low melting eutectic initially and which, however, form a high melting carbide as
the re...